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Seesaw Pattern of Rainfall Anomalies between the tropical western north pacific and Central Southern China during Late Summer

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Advances in Atmospheric Sciences 2019年第3期36卷 261-270,339页

作者： Xinyu LI Riyu LU State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of the Chinese Academy of Sciences College of Oceanography Hohai University

It is well known that suppressed convection in the tropical western north pacific(WNP) induces an anticyclonic anomaly,and this anticyclonic anomaly results in more rainfall along the East Asian rain band through more water vapor transport during summer, as well as early and middle summer. However, the present results indicate that during late summer(from mid-August to the beginning of September), the anomalous anticyclone leads to more rainfall over central southern China(CSC), a region quite different from preceding periods. The uniqueness of late summer is found to be related to the dramatic change in climatological monsoon flows: southerlies over southern China during early and middle summer but easterlies during late summer. Therefore, the anomalous anticyclone, which shows a southerly anomaly over southern China, enhances monsoonal southerlies and induces more rainfall along the rain band during early and middle summer. During late summer,however, the anomalous anticyclone reflects a complicated change in monsoon flows: it changes the path, rather than the intensity, of monsoon flows. Specifically, during late summers of suppressed convection in the tropical WNP, southerlies dominate from the South China Sea to southern China, and during late summers of enhanced convection, northeasterlies dominate from the East China Sea to southern China, causing more and less rainfall in CSC, respectively.

关键词： tropical western north pacific monsoon flows precipitation late summer

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Associations between the western north pacific Monsoon and the South China Sea Monsoon

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Advances in Atmospheric Sciences 2002年第1期19卷 12-24页

作者：陆日宇 Chan-Su Ryu Buwen Dong Institute of Atmospheric Physics Chinese Academy of Scienes Beijing 100080 Department of Earth Science. Chosun University Kwangju Korea CGAM Department of Meteorology University of Reading Reading United Kingdom

Based on the interannual variability of convection over the tropical western north pacific (WNP), a region of 130°—160°E, 10°—20°N, a composite analysis is performed on the fields of surface temperature, outgoing longwave radiation and 850 hPa zonal wind. The composite results show that the weaker (stronger) WNP convection is related to the El Nino (La Nina)—pattern sea surface temperature (SST) anomalies in the preceding winter and in spring. A comparison with previous results indicates that a similar spatial and temporal distribution of SST anomalies is also associated with the onsets of both the WNP and South China Sea (SCS) monsoons. The composite results also show that the weaker (stronger) convection over the WNP corresponds to the easterly (westerly) anomalies that extend westward from the WNP into the Bay of Bengal. A numerical experiment by an atmospheric general circulation model shows a similar result. In addition, during weaker (stronger) convection summer, the convection over the WNP and lower-level zonal winds over the SCS exhibit a small (large) extent of seasonal evolution.

关键词： South China Sea Lower-level zonal flow tropical western north pacific Monsoon, El Niñ o

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